单项选择题

I have told him several times that these young pines ______ watering twice a week.

A．require
B．appeal
C．demand
D．request
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单项选择题
The phrase white elephant is used to describe something that the owner ______.
A．loves to keep
B．bought cheap
C．wants to get rid of
D．wants to sell
单项选择题
We learned from the show that some insects could be used as medicine, ______ ants and bees.
A．in case of
B．such as
C．just like
D．as an example
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